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45 Magnum Engine

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  • 45 Magnum Engine

    Good 'Day All,

    I purchased a set of 45 cases that have been welded, machined and what I thought was ready to go to build a 45 magnum engine, however the cylinder bolt pattern do not match the early sportster cylinders I have. Below is a picture of the bolt hole pattern the was installed.
    Can anybody tell which bolt pattern I have?
    Disregard the actual gasket pictured as it was only used for illustration purposes, and measurments.
    Cylinder base gasket measurements.jpg


    Any help would be greatly appreciated,

    Thanks Brian
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